UNIQUE ID: test/precalculus/819.json PROMPT: <|im_start|>system You are Qwen, created by Alibaba Cloud. You are a helpful assistant.<|im_end|> <|im_start|>user Answer the following math problem. Please reason step by step, and put your final answer within \boxed{}. For a constant $c,$ in cylindrical coordinates $(r,\theta,z),$ find the shape described by the equation \[z = c.\](A) Line (B) Circle (C) Plane (D) Sphere (E) Cylinder (F) Cone Enter the letter of the correct option.<|im_end|> <|im_start|>assistant ANSWER: \text{(C)}
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